For solar applications, there are some nice chips that automatically limit current to keep operation in the most efficient oprating zone for the PV cell (MPPT). But they seem to be very expensive, and not widely stocked. For example, the LTC3105 is $3.33 at 2500, but only 419 in stock at Digi-Key. Do you know of any good chips that are inexpensive and available enough for consumer products?

Some info provided at teh following link but I do not know if the MPPT is part of their capability:

For solar applications, there are some nice chips that automatically limit current to keep operation in the most efficient oprating zone for the PV cell (MPPT). But they seem to be very expensive, and not widely stocked. For example, the LTC3105 is $3.33 at 2500, but only 419 in stock at Digi-Key. Do you know of any good chips that are inexpensive and available enough for consumer products?

The MEMS thermoelectric harvester would have to be connected to a hot and cold reservoir. How is this done on a MEMS scale?

The heat exchanger actually is about the same size as a bulk TEG in products that I have seen. The big advantage of the MEMS TEG is similar to MEMS sensors: the wafer level processing can provide consistent, high volume production and a ongoing cost reduction.

We are interested in harvesting energy from railroad track. We have battery powered sensors that are connected to the rail and being able to harvest some of that energy would give our sensors longer life.

Good Morning to everyone as well and the weather is not so nice here. Its a cold dreary day, but I am excited to hear todays lecture as well. Thank you Randy Frank for letting us have part of your time today!

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